Sewing machine with ring supported bobbin



May 1, 1962 w. ENGEL ET AL 3,031,989

SEWING MACHINE WITH RING SUPPORTED BOBBIN Filed Aug. 5, 1958 5Sheets-Sheet 1 Inventors May 1, 1962 w. ENGEL ET AL SEWING MACHINE WITHRING SUPPORTED BOBBIN 5 Sheets-Sheet 2 Filed Aug. 5, 1958 Inventors Wax/6w; vrgcz 44 0 #444; enwwarr:

May 1, 1962 w. ENGEL ET AL 3,031,989

SEWING MACHINE WITH RING SUPPORTED BOBBIN Filed Aug. 5, 1958 5Sheets-Sheet 5 May 1, 962 w. ENGEL ET AL 3,031,989

SEWING MACHINE WITH RING SUPPORTED BOBBIN Filed Aug. 5, 1958 5Sheets-Sheet 4 /mhg y 1, 1962 w. ENGEL ET AL 3,031,989

SEWING MACHINE WITH RING SUPPORTED BOBBIN Filed Aug. 5, 1958 r 5Sheets-Sheet 5 United States Patent 3,031,989 SEWING MACHINE WITH RINGSUPPORTED BOBBIN Wolfgang Engel, Bielefeld, and Hans Baumotte,Brackwede, Germany, assignors to Anker-Phoenix NahmaschinenAktiengesellschaft, Bielefeld, Germany Filed Aug. 5, 1958, Ser. No.758,637 (Filed under Rule 47(2) and '35 U.S.C. 116) Claims. (Cl.112-180) The invention relates to a sewing machine of the type having aring supported bobbin which cooperates with the looper in which for thepurpose of removing the bobbin casing the housing portion or plateadjacent the material feed dog must be opened. In such a machine theremoving and particularly also the insertion of the bobbin casing forexchanging the bobbin in an aperture in the frame presents particulardifliculties. With the feed dog closure open one is compelled to reachinto the interior of the material carrying plate ahead of the looperframe in order to release the latching of this bobbin supporting ring.

It is an object of the invention to simplify this rather cumbersomeoperation in a flat bed as well as in a free arm machine.

In accordance with the invention this object is achieved in that the.material feed plate or housing closure is coupled with the bobbin ringin such a manner that during opening or closing the material feed plateor other closure the bobbin ring is automatically brought into theposition for sewing.

This operation can be etfected, for example, in such a manner that thefree end of the bobbin ring frame is linked with the material feedplate. If the material feed plate or housing closure is then moveddownwardly with its inner end, the ring support is simultaneously openedand the bobbin housing is disposed in a position to be readily picked upby the seamtress.

For this purpose the ring frame and the material feed plate can bebiased as a unit by means of a spring which aids in the openingoperation of the housing closure or the material feed plate. If in thesewing position of the ring frame in the flat bed machine the link whichconnects the material feed plate and the ring support and the pivot pinfor the material feed plate are disposed approximately at right angles,then the unintentional opening of the material feed plate as a result ofpressure upon the plate is avoided.

The unintentional opening of the material feed plate and thus also theunintentional opening of the ring support may furthermore be preventedin that the ring support is provided with a latch having a lever. Aheadof this latching lever a locking sewing position of the ring supportwhich is movable by means of a manipulating device which can be operatedfrom the exterior.

In order to enable use of the sewing machine for normal sewingoperations as well as for embroidery or mending operations it iscustomary to arrange the material feed dog in a manner that it can belowered. For this purpose known machines are provided with amanipulating means which is connected by way of suitable linkage meansto the material feed dog. In accordance with the invention themanipulating means which is provided in a flat bed machine for thelatching as well as for the opening and the closing operation issimultaneously utilized for the raising and the lowering of the materialfeed dog.

In free arm machines material feed plates are not known. Instead thefree arm is provided with a housing closure lid which is adapted tocarry also the ring for the ring looper along its inner wall.

lever will be disposed in the "ice . machines having a housing closureflap.

Further details of the invention will become apparent from theembodiments illustrated in the drawings in which:

FIG. 1 is a bottom view of the sewing machine showing the driving gear,

FIG. 2 is a section taken along line II-II in FIG. 1 in the direction ofthe arrows,

FIG. 3 is a section long line III-III of FIG. 1 taken in the directionof the arrows,

FIG. 4 is a section along line IVIV of FIG. 1 with I the ring supportclosed seen in the direction of the arrows,

FIG. 5 is a section along line IVIV of FIG. 1 with the ring support opentaken in the direction of the arrows,

FIG. 6 is a plan view of the sewing machine base plate indicating thelocations for the lowering of the material feed dog and for opening thering support,

FIG. 7 is afront view of the free arm with its driving gear componentsand the feed dog lowering mechanism,

FIG. 8 is a top view upon the free arm showing the driving gear and thefeed dog lowering means with the cover removed,

FIG. 9 is a section along the line IXIX in accordance with FIGS. 7 and 8taken in the direction of the arrows,

FIG. 10 is a section along line XX in FIGS. 7 and 8 taken in thedirection of the arrows,

FIGS. 11 is an end view of the free arm in accord-. ance with FIG. 7looking in the direction of the arrow with the free arm closure lidlatched, and

FIG. 12 is a view of the free arm seen in the direction of the arrowwith the free arm closure open.

The belt pulley of the arm shaft which is not illustrated and which issecured upon the main drive shaft of the sewing machine drivesintermediate shaft 2 mounted in the base 1" through the standard 1' byway of belt pulley 3 and belt 3 at a ratio of 1:1.

A worm gear 4 is mounted at the left front end of the intermediate shaft2 having a corresponding gear 5 which is mounted upon the transverselydisposed looper shaft 6 and which. drives at its front end the looper 7at a ratio 2:1. The looper shaft 6 is carried at its rear end in thebearing sleeve 6 which is mounted in the base '1". The base 1" isprovided with a cover plate 1" for reasons of manufacturing convenience.

The thrust for the feed dog 8 (FIGS. 3 and 4) is produced by means of acam 9 mounted upon intermediate shaft 2 which cam cooperates with anadjustable grooved guide block 10 (FIG. 2). The forked lever 11 which isconnected to the slide and reaches around cam 9 is provided on one sidewith the stud 12 which carries the sliding member 13 which moves in thegrooved block 10. The other end of the forked lever 11 is linked to thestud 14 which is secured in the crank 15 which transmits the movement ofthe forked lever 11 to the feed shaft 17 mounted in the base 1" by meansof pintles 16 and 16.

' The movement of the feed shaft 17 is transmitted by way of crank 18 tothe feed bar 19 at the forward end of the base 1" and the material feeddog 8 is secured to the forward end of said feed bar. By means of theoperat ing handle 20 journalled in the standard 1' the position of thegrooved member 10 and thus the material feed dimension and direction isvaried by way of the connecting bar 21 and the crank 22 secured upon thestud 12 in the grooved block 10 (see FIG. 2).

The thrust of the feed dog 8 is produced by means of a cam 24 upon theintermediate shaft 2 (see FIG. 3).

The connecting bar 23 engages the cam 24 at one end. The connecting baris linked at its other end to the one arm 25 of the angular lever 25 inthe base 1". The jaws 19' of the feed bar 19 engage the shaft 26 whichis mounted for axial displacement on the other end of the lever arm 25of the angular lever 25 (see FIG. 6).

The lowering of the feed dog 8 is effected by a setting knob 27journalled in the rear portion of the base 1". Its shaft 27 guided inthe base 1 carries a crank 28 to which is linked one end of the draw bar29 while the other end is linked by means of an eyelet 29 to the centralpart of a lever 36 which is secured by means of screw 30 to the base 1".An elongated slot 30 is'provided in the fore part of the lever 30 whichis engaged by a pin 31 of the shaft 26. By rotating the setting knob 27to the position III indicated in dotted lines, the draw bar 29 by way ofcrank 28, the lever 30 and the pin 31 withdraws the shaft 26 from thejaws 19' of the feed bar 19. Thus the path for lowering the feed bar 19with the feed dog secured thereto is freed. By rotating the setting knob27 into the position II, indicated in dotted lines, the shaft 26 ispushed back by spring 39 over lever 30 into the jaws 19' of the feed bar19 and the thrust movement of the angular lever 25 is again transmittedto the feed bar 19.

The looper 7 upon the looper shaft 6 in its course, engages the bobbinhousing 7, which is held in its position by a ring 32' in the ringsupport 32. The ring support 32 carries a pivot support such as fixedbolt 33 at its lower end which is journalled in the base 1 in bearings33' and 33" at right angles with respect to the looper shaft 6. Bolt 33carries at its right end a lever 34 which can be secured in position bymeans of screw 34' and which at its. upper end engages lever 30 when thelooper ring is in closed position (see FIG. dotted lines). By rotatingthe setting knob 27 into position I the lever 30 is shifted in thedirection towards the looper 7 by way of draw bar 29 and with the lever34 on the shaft 33 released the ring on the frame is drawn down by meansof tension spring 35 to the abutment 36 which is secured to the base 1"by means of screws 36' and 36". The closure slide or feed plate 37 whichis linked to the upper end of the ring support 32 by hinge means in theform of pin 35 is simultaneously shifted along a longitudinal slot 38'about the bolt 38 mounted in the base 1" in the direction of the arrow Ashown in FIG. 5. The ring 32' is now opened and thus free for exchangingthe bobbin. The closing of the ring 32 is effected by the pressure uponthe outer edge of the closure slide or feed plate 37 in the direction ofthe arrow B thereby moving the feed plate to the horizontal positionupon the cover plate 1 which closes the base 1". In this position thelever 30 is shifted by means of spring 39' in front of lever 34 whichholds the ring frame 32 in closed position upon the common shaft 33. Thebase 1 is advantageously provided with a closure plate 40, the lowerfour corners of which are provided with rubber feet 41 to thus securethe upper part of the machine against sliding and also to protect theoperating components provided in the interior against soiling, or alsoto collect any oil which might drop down.

The arrangements described hereinabove, the opening of the, ring frame32 by means of a manipulating member provided externally of the upperpart of the machine relate to flatbed machines.

Hereinafter an embodiment is described with reference to FIGS. 7-12which relates to free arm sewing machines. The drive shaft 52 journalledin free arm 51 is driven by way of a pulley upon the arm shaft (notshown) by way of a second belt pulley 53 and the belt 53' at a ratio1:1. A worm gear 54 which is secured upon drive shaft 52 meshes with acooperating gear 55. The latter is provided upon the intermediate shaft51 by means of screws and provides for the transmission to thetransverse- 1y disposed looper shaft 59 at a ratio 2:1. The inter- 4sleeves 56' and 56" in the free arm 51. At the left front end of theintermediate shaft 56 a warm gear 57 is provided which in turn mesheswith teeth of the coopcrating gear 58 provided upon looper shaft 59 thusinsuring the drive at a ratio of 1:1 with respect to looper 60.

The thrust for the material feed bar 61 is produced by means of a cam 62secured to drive shaft 52 in combination with the adjustable groovedblock 63 (see FIGS. 8 and 9). At the closed jaw lever 64 which engagescam 62, a bolt 65 is riveted on one side which carries the slide member66 which slides in the grooved block 63. The other end of the closed jawlever 64 is linked to the bolt 67 which is secured to the crank 68 (seeFIG. 9). The crank 68 is fastened upon feeding shaft 71 by means of thecollar screw 68' and transmits the movement of the closed jaw lever 64to the feed bar 71 provided in the free arm 51 and journalled on pintles69 and 70 which at the forward end of the free arm 51 support crank arms72 and 73 in which the. pintles 74 and 75 are journalled. These conicalpintles 74 and 75 support the feed bar 76 suspended therebetween andupon the forward end of which is secured the feed dog 61 by means of thetwo collar screws 77 and 78. By shifting the manipulating handle 79journalled externally of the base 51" upwardly or downwardly in the base51' the movement is transferred by way of connecting bar 80 and thecrank 83 secured to the extended. stud 63 (FIG. 8), of the slide block63 to the feed dog 61 and determines the magnitude and direction of feedin relation to the position of the grooved block 63.

The stroke of the feed dog 61 is likewise produced by a cam 82 which isaxially displaceable upon the single rotation drive shaft 52 (FIGS. 8and 10). By means of a slide member 84 adjustably secured by means of ascrew 83 upon the forward portion of the feed bar 76, the feed bar 76 issupported upon cam 82 and is held in position upon cam 82 by a tensionspring 85 suspended on the pin 85' in the free arm 51. The lowering ofthe feed dog 61 below the stitch plate 61' is effected by a setting knob86 which is accessible from the exterior and mounted on the rear portionof the free arm 51. The crank is secured upon the shaft 88 by means ofscrew 89 journalled in the sleeve 87 in free arm 51. In the lower partof the crank 90 the pin 92 which is provided with a screw 91 is securedwhich with its projecting portion 92' engages the groove 93' of the disk93 which is secured upon a draw bar 94 by means of a screw 94' whichthrough a drive shaft 52 in the form of a hollow shaft leads forward tothe displaceable stroke cam 82. The cam 82 is secured by means of acylindrical pin 95 to the draw bar 94 in the forward end of the strokecam 82 which secures the stroke cam 82 against rotation andsimultaneously is movable in the longitudinal slot 52' of the driveshaft 53-. By rotating the setting knob 86 into position III to theright, the cam 82 upon shaft 52 is shifted to the left towards thelooper v60 by way of the crank 90, pin 92, disk 93, draw bar 94 andcylinder pin 95.

The sliding member 84 comes to rest upon the cylindrical portion 82 ofthe cam 82 which is smaller in diameter and permits the feed dog 61 tosink below the stitch plate 61'. By turning back the setting knob 86into position II (center) the cam 82 together with its eccentric portion82 is withdrawn below the slide member 84 and the draw bar 76 is againbrought in operative engagement'with the feed .dog- 61.

The transversely disposed shaft 59 carries at its forward end looper 68which in its path of operation receives the bobbin shell 60, which isheld in its position by means of ring 96. The ring 96 is secured in thehousing lid 99 by means of its stud 97 and screwv 98 which lid ispivotally connected in free arm 51 by means of pin 100. The nose 101 ofthe, sliding member 102 mounted in free mediate shaft 56 is journalledat two ends in the bearing 75 arm 51 by means of sleeve engages thecatch i104 secured in the housing lid 99 by means of screws 103 and 103and thus keeps the housing lid 99 closed.

By rotating the setting knob 86 into position I toward the left the cam82 is moved toward the right of the looper 60 by way of theaforementioned mechanism and the central part 82' of the cam 82 incombination with the pin 108 secured in the slide 102 is pushed awayfrom the looper 60. The nose 101 of the slide frees the catch 104 andthus the housing lid 99 which is automatically opened under the pressureof the bolt 106 against spring 107 upon receding part 99 of the housinglid 99. The closing of the housing lid and thus simultaneously of thering 96 secured therein is effected manually until the nose 101 of theslide 102 again snaps behind the catch 104 under the pressure of spring109.

We claim:

1. In a sewing machine of the type having a housing, and including adrive shaft suported in said housing, a feed bar comprising a feed dogsupported in said housing, a feed plate extending in closed condition inalignment with said feed dog, a ring looper, a bobbin, a ring tiltablysupporting said bobbing proximate said looper for cooperation therewith,a rotatable shaft extending transversely of said housing and supportingsaid looper proximate said feed dog for rotation about its axis in fixedposition relative to said feed plate, and further including driving gearfor said feed bar and for said rotatable shaft and said looperoperatively connected to said drive shaft; a pivot suport disposed belowsaid looper, hinge means provided at the end of said feed plate adjacentsaid feed dog and a ring support carrying said bobbin supporting ring,said ring support being connected at one end to said pivot support andat the other end to said hinge means and being movable with saidsupporting ring and by means of said feed plate relative to said looper.

2. In a sewing machine of the type having a housing, and including adrive shaft suported in said housing, a feed bar comprising a feed dogsupported in said housing, a feed plate extending in closed condition inalignment with said feed dog, a ring looper, a bobbin, a ring tiltablysupporting said bobbin proximate said looper for cooperation therewith,a rotatable shaft extending transversely of said housing and supportingsaid looper proximate said feed dog for rotation about its axis in fixedposition relative to said feed plate, and further including driving gearfor said feed bar and for said rotatable shaft and said looperoperatively connected to said drive shaft; a pivot support disposedbelow said looper, hinge means provided at the end of said feed plateadjacent said feed dog and a ring support carrying said bobbinsupporting ring, said ring support being connected at one end to saidpivot support and at the other end to said hinge means and being movablewith said supporting ring and by means of said feed plate relative tosaid looper, said feed plate being pivotally supported and slidable onthe machine housing for tilting movement, and said ring support beingmovable into inclined position in alignment with said feed plate for theposition of disengagement between said ring and said looper and into aposition at right angles with respect to said feed plate for theoperative position of said ring relative to said looper.

3. In a sewing machine of the type having a housing, and including adrive shaft supported in said housing, a feed bar comprising a feed dogsupported in said housing, a feed plate extending in closed condition inalignment with said feed dog, a ring looper, a bobbin, a ring tiltablysupporting said bobbin proximate said looper for cooperation therewith,a rotatable shaft extending transversely of said housing and supportingsaid looper proximate said feed dog for rotation about its axis in fixedposition relative to said feed plate, and further including driving gearfor said feed bar and for said rotatable shaft and said looperoperatively connected to said drive shaft; a pivot support disposedbelow said looper, hinge means provided at the end of said feed plateadjacent said feed dog and a ring support carrying said bobbinsupporting ring, said ring support being connected at one end to saidpivot support and at the other end to said hinge means and being movablewith said supporting ring and by means of said feed plate relative tosaid looper, said feed plate being pivotally supported and slidable onthe machine housing for tilting movement, and said ring support beingmovable into inclined position in alignment with said feed plate, aguide pin for said feed plate being mounted in said housing and a pairof slotted guide members being disposed below said feed plate andslidable on said guide pin.

4. In a sewing machine of the type having a housing, and including adrive shaft supported in said housing, a feed "bar comprising a feed dogsupported in said housing, a feed plate extending in closed condition inalignment with said feed dog, a ring looper, a bobbin, a ring tiltablysupporting said bobbin proximate said looper for cooperation therewith,a rotatable shaft extending transversely of said housing and supportingsaid looper proximate said feed dog for rotation about its axis in fixedposition relative to said feed plate, and further including driving gearfor said feed bar and for said rotatable shaft and said looperoperatively connected to said drive shaft; a pivot support disposedbelow said looper, hinge means provided at the end of said feed plateadjacent said feed dog and a ring support carrying said bobbinsupporting ring, said ring support being connected at one end to saidpivot support and at the other end to said hinge means and being movablewith said supporting ring and by means of said feed plate relative tosaid looper, said feed plate being pivotally supported and slidable onthe machine housing for tilting movement, and said ring support beingmovable into inclined position in alignment with said feed plate, aguide pin for said feed plate being mounted in said housing and a pairof slotted guide members being disposed below said feed plate andslidable on said guide pin and an abutment being disposed in saidhousing below said feed plate for engagement by said ring support andsaid feed plate in said aligned position, and a spring being secured atone end to said housing and at the other end to the joint between saidring support and said feed plate for biasing said support and said platedownwardly.

5. In a sewing machine of the type having a housing, and including adrive shaft supported longitudinally of said housing, a feed barsupporting a feed dog and extending transversely of said housing, a feedplate extending in closed condition in alignment with said feed dog, aring looper, a bobbin, a ring tiltably supporting said bobbin proximatesaid looper for cooperation therewith, a rotatable shaft extendingtransversely of said housing and supporting said looper proximate saidfeed dog for rotation about its axis in fixed position relative to saidfeed plate, and further including driving gear for said feed bar and forsaid rotatable shaft and said looper operatively connected to said driveshaft, and means for adjusting said feed dog including jaws at one endof said feed bar and a transverse shaft movable relative to said jaws; apivot support disposed below said looper, hinge means provided at theend of said feed plate adjacent said feed dog and a ring supportcarrying said bobbin supporting ring, said ring support being connectedat one end to said pivot support and at the other end to said hingemeans and being movable with said supporting ring and by means of saidfeed plate relative to said looper, said feed plate being pivotallysupported and slidable on the machine housing for tilting movement bymeans including a guide pin for said feed plate mounted in said housingand a pair of slotted guide members disposed below said feed plate andslidable on said guide pin, said means for adjusting said feed dogfurther including an adjusting knob and an operating lever linked tosaid adjusting knob and movable therewith to raise and lower said feeddog and to move said transverse shaft relative to 'said jaws, and saidpivot shaft of said ring support having a member defining a latchrotatable With said pivot shaft and with said ring support adapted inthe operative positon of said feed plate to engagesaidoperating leverfor locking said lever in operative position. References Cited in thefile of this patent UNITED STATES PATENTS 1,086,662 Gould Feb. 10, 1914Hemle-b Aug. 4, 1925 Goosman Dec. 26, 1933 Backlin Mar. 9, 1954 FOREIGNPATENTS Germany July 22, 1933 Germany Oct. 29, 1940

